Jac Lewis, from Penygroes near Caernarfon, studied Engineering at Coleg Menai in 2014, whilst completing a three year Apprenticeship programme at Wylfa on Anglesey.
Since completing the Apprenticeship, Jac now works as a Process Engineer for Unilever in Wirral.
Jac completed the gruelling challenge over the Easter weekend, where he set off at 6am on Friday morning, from the bottom of the Marchlyn Mawr Lake, up to the dam. He completed 101 laps, and in total, the challenge was over 360 miles in length, and over 87,000 feet high!
Jac said, "Thank you to everyone who's donated so far to this worthy cause. I wanted to raise money for Alzheimer's Society, as the disease has affected my family and my fiance's family."
"I'd like to thank my friend Callum Dixon, who completed one Everest length alongside myself, as well as Ross Howcroft-Jones, Aiden O'leary, Kieran Wynne-Cattanach, Jack Cole and Chris Mann, who supported me and also completed many laps, too"
He added, "I'd encourage everyone to challenge themselves once in a while! Train hard and go for it, it's really rewarding."
You can read more about Jac's GoFundMe campaign, and donate here.